Zithini iimpawu zerabha ye-EPDM?

1. Uxinano oluphantsi kunye nokuzaliswa okuphezulu
Irabha ye-ethylene-propylene yirabha enobunzima obuphantsi, enobunzima obuyi-0.87. Ukongeza, inokuzaliswa ngeoyile eninzi kunye ne-EPDM.
Ukongeza izizalisi kunokunciphisa iindleko zeemveliso zerabha kwaye kuhlawule ixabiso eliphezulu lerabha eluhlaza ye-ethylene propylene. Kwirabha ye-ethylene propylene enexabiso eliphezulu leMooney, amandla omzimba nawoomatshini okugcwalisa okuphezulu akancitshiswanga kakhulu.

2. Ukumelana nokwaluphala
Irabha ye-ethylene-propylene inokumelana okuhle kakhulu nemozulu, ukumelana ne-ozone, ukumelana nobushushu, ukumelana ne-asidi kunye ne-alkali, ukumelana nomphunga wamanzi, ukuzinza kombala, iimpawu zombane, iimpawu zokuzalisa ioyile kunye nokugeleza kubushushu begumbi. Iimveliso zerabha ze-ethylene-propylene zingasetyenziswa ixesha elide kwi-120°C, kwaye zingasetyenziswa okwethutyana okanye ngamaxesha athile kwi-150-200°C. Ukongeza ii-antioxidants ezifanelekileyo kunokunyusa ubushushu bokusetyenziswa kwayo. Irabha ye-EPDM edityaniswe ne-peroxide ingasetyenziswa phantsi kweemeko ezinzima. Irabha ye-EPDM inokufikelela ngaphezulu kweeyure ezili-150 ngaphandle kokuqhekeka phantsi kweemeko zoxinzelelo lwe-ozone lwe-50pphm kunye nokwelulwa kwe-30%.

3. Ukumelana nokugqwala
Ngenxa yokuba irabha ye-ethylene propylene ayinayo i-polarity kwaye ayinayo i-unsaturation, inokumelana okuhle neekhemikhali ezahlukeneyo ze-polar ezifana nee-alcohols, ii-asidi, ii-alkalis, ii-oxidants, ii-refrigerants, ii-detergents, ii-oyile zezilwanyana nezemifuno, ii-ketones kunye neegrisi. Kodwa ayinazinzo kwi-fatty kunye ne-aromatic solvents (ezifana ne-petroli, i-benzene, njl.njl.) kunye ne-mineral oil. Ukusebenza kwayo kuya kuncipha phantsi kwesenzo sexesha elide se-concentrated acid. Kwi-ISO/TO 7620, phantse iintlobo ezingama-400 zeekhemikhali ze-corrosive gaseous kunye ne-liquid chemicals ziqokelele ulwazi malunga neepropati ezahlukeneyo zerabha, kwaye zichaze amanqanaba ali-1-4 ukubonisa inqanaba lesenzo sazo, kunye nempembelelo yeekhemikhali ze-corrosive kwiipropati zerabha.

Umthamo webanga Izinga lokudumba/% Ixabiso lokunciphisa ubulukhuni Impembelelo ekusebenzeni
1 <10 <10 kancinci okanye hayi
2 10-20 <20 ezincinci
3 30-60 <30 ephakathi
4 >60 >30 kakhulu

4. Ukumelana nomphunga wamanzi
Irabha ye-ethylene-propylene inokumelana kakuhle nomphunga wamanzi kwaye kuqikelelwa ukuba ingcono kunokumelana nobushushu bayo. Kwi-230℃ umphunga oshushu kakhulu, ukubonakala kwe-EPDM akuzange kutshintshe emva kweeyure eziphantse zibe yi-100. Nangona kunjalo, phantsi kweemeko ezifanayo, irabha ye-fluorine, irabha ye-silicone, irabha ye-fluorosilicone, irabha ye-butyl, irabha ye-nitrile, kunye nerabha yendalo ziye zafumana ukuwohloka okukhulu kwembonakalo emva kwexesha elifutshane.

5. Ukumelana namanzi ashushu kakhulu
Irabha ye-ethylene-propylene ikwanokumelana okungcono namanzi ashushu kakhulu, kodwa inxulumene ngokusondeleyo nazo zonke iinkqubo ze-vulcanization. Irabha ye-ethylene-propylene ene-dimorpholine disulfide kunye ne-TMTD njengenkqubo ye-vulcanization, emva kokuntywiliselwa emanzini ashushu kakhulu kwi-125°C kangangeenyanga ezili-15, iimpawu zoomatshini azitshintshi kakhulu, kwaye izinga lokwandiswa komthamo yi-0.3% kuphela.

6. Ukusebenza kombane
Irabha ye-ethylene-propylene ineempawu ezibalaseleyo zokuthintela ubushushu bombane kunye nokumelana ne-corona, kwaye iimpawu zayo zombane zingcono okanye zisondele kwezo zerabha ye-styrene-butadiene, i-polyethylene e-chlorosulfonated, i-polyethylene kunye ne-polyethylene edibeneyo.

7. Ukuguquguquka
Ngenxa yokuba akukho zinto zithatha indawo ye-polar kwisakhiwo se-molecular se-ethylene-propylene rubber, amandla adibeneyo e-molecule aphantsi, kwaye i-molecular chain inokugcina ukuguquguquka kuluhlu olubanzi, olulandela kuphela i-natural regotiable kunye ne-butadiene rubber, kwaye isenokugcinwa kumaqondo obushushu aphantsi.

8. Ukunamathela
Irabha ye-ethylene-propylene ayinamaqela asebenzayo ngenxa yesakhiwo sayo seemolekyuli kwaye inamandla amancinci okubambisana. Ukongeza, irabha kulula ukuyiqhakaza, kwaye ukuzincamathela kwayo kunye nokunamathelana kwayo kuphantsi kakhulu.